Question: Which is the fictional universe of the fictional universe described in Star Trek?
Paraphrase: Which is the anecdotal universe of the anecdotal universe portrayed in Star Trek?
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P1445 wd:Q1092 . ?sbj wdt:P31 wd:Q559618 } 
Answer: Star Trek multiverse